<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="root"></div>
    <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <script type="text/babel">


        //  
        function FunDefault(props) {
            return (
                <div>  a:{props.a} b:{props.b} c:{props.c} </div>
            )
        }
        // 属性默认值
        FunDefault.defaultProps = {
            a: 1, b: 2, c: 3
        }

        class ClassDefault extends React.Component {
            render() {
                return (
                    <div>  a:{this.props.a} b:{this.props.b} c:{this.props.c} </div>
                )
            }
        }
        // 属性默认值
        ClassDefault.defaultProps = {
            a: 1, b: 2, c: 3
        }

        const html = (
            <div>
                <FunDefault />
            </div>)
        ReactDOM.render(html, document.getElementById('root'))
    </script>
</body>

</html>